On Sat, Apr 4, 2015 at 1:10 AM, Andrew Morton <a...@linux-foundation.org> wrote: > On Fri, 03 Apr 2015 20:18:18 +0300 Konstantin Khlebnikov > <khlebni...@yandex-team.ru> wrote: > >> A lot of filesystems use generic_file_mmap() and filemap_fault(), >> f_op->mmap and vm_ops->fault aren't enough to identify filesystem. >> >> This prints file name, vm_ops->fault, f_op->mmap and a_ops->readpage >> (which is almost always implemented and filesystem-specific). >> >> Example: >> >> [ 23.676410] BUG: Bad page map in process sh pte:1b7e6025 pmd:19bbd067 >> [ 23.676887] page:ffffea00006df980 count:4 mapcount:1 >> mapping:ffff8800196426c0 index:0x97 >> [ 23.677481] flags: 0x10000000000000c(referenced|uptodate) >> [ 23.677896] page dumped because: bad pte >> [ 23.678205] addr:00007f52fcb17000 vm_flags:00000075 anon_vma: >> (null) mapping:ffff8800196426c0 index:97 >> [ 23.678922] file:libc-2.19.so fault:filemap_fault >> mmap:generic_file_readonly_mmap readpage:v9fs_vfs_readpage > > Is that why we print these out? Just to identify the fs type? > > There's always vma->vm_file->f_inode->i_sb->s_magic ;)
Yes, but that also might be anon inode/file mapped by some driver, so s_magic isn't enough. > > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majord...@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"d...@kvack.org";> em...@kvack.org </a> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
